/*
 * ==========================================================================================
 * =                   JAHIA'S DUAL LICENSING - IMPORTANT INFORMATION                       =
 * ==========================================================================================
 *
 *                                 http://www.jahia.com
 *
 *     Copyright (C) 2002-2020 Jahia Solutions Group SA. All rights reserved.
 *
 *     THIS FILE IS AVAILABLE UNDER TWO DIFFERENT LICENSES:
 *     1/GPL OR 2/JSEL
 *
 *     1/ GPL
 *     ==================================================================================
 *
 *     IF YOU DECIDE TO CHOOSE THE GPL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS:
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 *
 *     2/ JSEL - Commercial and Supported Versions of the program
 *     ===================================================================================
 *
 *     IF YOU DECIDE TO CHOOSE THE JSEL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS:
 *
 *     Alternatively, commercial and supported versions of the program - also known as
 *     Enterprise Distributions - must be used in accordance with the terms and conditions
 *     contained in a separate written agreement between you and Jahia Solutions Group SA.
 *
 *     If you are unsure which license is appropriate for your use,
 *     please contact the sales department at sales@jahia.com.
 */
package org.jahia.taglibs.search.facets;

import java.util.HashSet;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

/**
 * Custom search facet functions, which are exposed into the template scope.
 *
 * @author Sergiy Shyrkov
 * 
 * @since 7.2.3.1
 */
public class Functions {

    /**
     * Retrieves the data of the requested facet to be used in a JSP view when rendering facet search results.
     * 
     * @param facetId the ID of a facet to retrieve information for
     * @param request current HTTP request instance
     * @return the data of the requested facet to be used in a JSP view when rendering facet search results
     */
    public static FacetData getFacetData(String facetId, HttpServletRequest request) {
        FacetData data = new FacetData();
        data.setParameterNameRegex("src_facets\\(" + facetId + "\\).*");
        data.setValueParameterName("src_facets(" + facetId + ").value.values");

        populateActiveValues(data, request);

        return data;
    }

    private static void populateActiveValues(FacetData data, HttpServletRequest request) {
        String[] values = request.getParameterValues(data.getValueParameterName());
        if (values != null && values.length > 0) {
            Set<String> activeValues = new HashSet<>();
            for (String val : values) {
                activeValues.add(val);
            }
            data.setActiveValues(activeValues);
        }
    }
}
